Chimney-cowl.



No; 861,966. ,PATENTED JULY 30, 1907.

' E. A. GERRARD.

CHIMNEY COWL.

APPLICATION FILED APR. 9, 1907.-

)NVENTOR WARD AEERRARD ATTORNEYS. Y

EDWARDA. GERRARD, or MONROE, NEBRASKA.

CHIMNEY-COWL.

Specification of Letters Patent.

Patented July 30, 1907.

Application filed April 9, 1907- Serial No. 367,185.

To all whom it may concern:

Be it known that I, EDWARD A. GERRARD, a citizen of the United States, and a resident of Monroe, in the county of Platte and State of Nebraska, have invented certain new and useful Improvements in Chimney- Cowls, of which the following is a specification.

My invention is an improvement in cowls, and consists in certain novel constructions and combinations of parts as will be hereinafter described and claimed.

In the drawing Figure 1 is a perspective view of a cowl embodying my invention. Fig. 2 is a vertical longitudinal section thereof. Fig. 3 is a cross-section on about line 3-3 of Fig. 2.

The base plate A is provided with an upwardly projecting tube B at its center and this base plate is preferably notched at its corners at A and perforated at A so that when the edges of the base plate are turned down over the top of the chimney it may be secured by wire bolts passing through openings A in the depending wings or'flanges M, which latter depend along the opposite sides of the chimney as best shown in Fig. 2.

spider as shown in Fig. 2 of the drawing. Rollers E are journaled by vertical axes in connection with the revolving tube C and bear against the outer surface of the base tube B, and thus relieve friction in the revolution of the tube 0, as will be understood from the drawings.

The rear opening C slopes inwardly toward its upper end as shown in Figs. 1 and 2 and lugs C extend rearwardly on opposite sides of said opening at the upper end of the revolving tube and have bearings at F for the trunnions on the bladed wheel F, which latter revolves on a horizontal axis in rear of the axis of the revolving tube and below the top of said tube so that its blades will swing upwardly within the upper portion of the tube G by the action of the wind on the upper most blades and will thus operate to draw up smoke and the like from the revolving tube and thus increase or improve the draft and clearance at the top of the chimney, as desired. It will be noticed that the revolving tube has a rearwardly projecting vane C upon which the wind will act to properly face the cowl and the wind coming from the direction of the arrow No. 1 in Fig. 2 will operate to revolve the bladed wheel in the direction of the arrow No. 2 in the same figure, the wind being held to the blades of the wheel by the cover G mounted upon the revolving tube and open at both ends, as shown in Fig. 2 and also serving as a cover for the revolving tube in the operation of the invention, as before described. I

In constructing the cover 1 form it from a flat plate of metal approximately square and bend it to bring its diagonally opposite corners downward forming the side wings G which are secured at G to the opposite sides of the upper end of the revolving tube, as will be understood from Figs. 1 and 2 of the drawing. It will be noticed that the opening C not only provides for the revolution of the wheel below the upper end of the revolving tube, and into the bore of said tube, but also permits the ready escape of smoke and the like with the natural draft when there is no wind.

The wheel F may have its blades braced at F, as shown, and is preferably mounted to turn loosely on its shaft F which is mounted in bearings F in the rearwardly projecting side lugs, as before described and may be bushed at F with leather or the like suitably confined to avoid wearing and operating to prevent any unnecessary noise in the revolution of the wheel by the wind.

The vane C is preferably made of sheet metal having its longitudinal edges at C turned in opposite directions in order to stiffen the vane and also having at its inner end the flanges C lapping against the revolving tube and secured thereto, as will be understood tube and having near said end rollers bearing against the side of the base tube, pivotal connections between the revolving tube and the base tube, the said revolving tube being provided with a rearwardly projecting vane and having its rear'side at its upper portion cut away and provided with rearwardly projecting lugs on opposite sides of the cut away portion at the upper end of the revolving tube, abladed wheel journaled between said rearwardly projecting lugs on an approximately horizontal axis and having its blades arranged to operate through the opening in the upper rear end of the revolving tube and upwardly across the interior of said tube, and a cover extending over the said wheel and ever the upper end of the revolving tube and secured thereto, substantially as set forth.

2. A cowl having a revolving tube provided at its upper end at its rear side with an opening and at the opposite sides of said opening with rearwardly projecting lugs and a bladed wheel having an approximately horizontal axis and journaled between said rearwardly projecting lugs EDWARD A. GERRARD.

Witnesses HOWARD .T. HILL, WILLIAM Wnnsrnn.

below the upper end of the revolving tube and having its 

